WEBVTT IT'S A CLIMB, TOWERING 4,000FEET FROM THE YOSEMITE VALLEYFLOOR.rtFOR SOME, IT CAN TAKE DAYS TOFINISH.>> WE WERE DIRECTLY UNDERNEATHTHE ROCK FALL SO, HAD WE NOTCLIMBED AS QUICKLY AS WE DID,rtWHICH IS QUICKER THAT I USUALLYCLIMB, WE'D BE DEAD NOW.DANA: PETER ZABROCK WAS ON DAY 6OF HIS CLIMB WHEN THE RUMBLINGBEGAN.>> A PIECE OrtF ROCK THE SIZE OFAN APARTMENT BUILDING ABOUT100FT.BY 100FT.BY 100 FEET PEELED OFF THE WALLAND HURDLED TO THE GROUND.rtDANA: THE ROCK SHATTERED INTOTHOUSANDS OF PIECES.KILLING ONErt PERSON AND INJURINGTHIS WOMAN.HERE SHE IS BEING HELPED INTO AHELICOPTER.>> LIKE BOMBS GOING OFF.YEAH, IT JUST ECHOES THROUGH THEVALLEY.rtDATA: MELISSA HORTIK WAS MUCHFARTHER AWAY.>> WE HAD OUT BINOCULARS ANDANOTHER GUY HAD A TELESCOPE ANDWE JUST KIND OF LOOKED OVER, UPON THE ROCK AT THE OTHERCLIMBERS WHO WERE UP THERE.FEELING FOR THEMrt THAT THEYWERE-THEY KNEW THAT THEY JUSTHAD TO KEEP ON GOING AND THEYWERE A WAYS AWAY.DANA: LIVrtECOPTER3 WAS OVERHEADAS A PARK RANGER HELICOPTERFOCUSED ON THE AREA OF THEROCKSLIDE.YOSEMITE OFFICIALS SAY THIS IS APOPULAR CLIMBING ROUTE, AND ATLEAST 30 CLIMBERS WERE ON THEALL AT THE TIME OF THE SLIDE.IT'S A CLIMB, PETER ZABROCK WILLNEVER FORGET.rtAND HE'S GRATEFUL TO BE ALIVE.>> I CALLED MY DAD TO TELL HIM IWAS ALIVE.

A hunk of rock "the size of an apartment building" fell off the granite face of El Capitan in Yosemite National Park on Wednesday, killing one person and injuring another on a mountain at the height of climbing season, officials and witnesses said.At least 30 climbers were on the wall at the time, but it was not clear if the victims were climbers or tourists, ranger Scott Gediman said.The injured person was taken to a hospital near the park.Get the full story in the video above.

A hunk of rock "the size of an apartment building" fell off the granite face of El Capitan in Yosemite National Park on Wednesday, killing one person and injuring another on a mountain at the height of climbing season, officials and witnesses said.

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At least 30 climbers were on the wall at the time, but it was not clear if the victims were climbers or tourists, ranger Scott Gediman said.